"He talks about a broken system abused by scroungers – but has chosen to take advantage of it himself.”

Witnesses told how Mr Osborne and his entourage went for a McDonald’s as his driver sat inside the official car before popping out for a crafty cig.

One disgusted onlooker – a businessman in his 40s who admitted being a Tory voter – said: “I couldn’t believe my eyes when I saw his driver pull into the disabled parking bay.

"It’s not as if they were in a rush to move. The car park wasn’t exactly full and there were plenty of other, ordinary spaces.”

The Chancellor had stopped at Magor services, near Newport, Gwent, as he returned from a speaking engagement at a nursery in Cardiff yesterday.

A close source said tonight: “He was dropped off outside the service station.

"While he was inside the car was moved to a disabled bay. He does not condone what happened in any way.”

But the source did not say if the Chancellor had admonished his driver.

Snapped: Mr Osborne and an aide aboard in first class seat last year (Image: Rachel Townsend/ITV Granada)

It is not the first time Mr Osborne, who was booed by an 80,000-strong crowd at the Paralympics last year, has been accused of flouting the rules.

Last year the former Bullingdon Club boy was embroiled in the “Great Train Snobbery”, when he boarded a first class train carriage with only a second class ticket – and was eventually forced to cough up an extra £160.

In a further embarrassment, one service station worker admitted: “Not many people recognised him as George Obsorne.